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In this discussion, I agree with @Dale opinion : "In order to light up a bulb must have a substantial amount of current through it. It is not designed to do that in response to a small RF signal propagating through free space. Although such a signal exists and would produce some minuscule...

Yes he is correct only in a part that small current will travel through bulb at t=1/c, but this small induced current will not turn light ON. If bulb need aprox voltage of battery(that is ussualy case) then induced current is many billions too small to start the light.. So this is trick...

Dont agree with answer 1/c, this is trick question,because he said any amount of energy/ current will turn on light bulb.. If any current will turn on light,then yes he is right... But this "induced current" is so low, it is not enough to trigger light...so answer 1m/c is wrong, correct...

So it is not important how long are wires, its only importnat distance between bulb and battery? this sound crazy

300 000km connect light bulb and battery. I would say 1sec is need from I turn on switch to light start lighting. This video say it is 1m/c...Is this video wrong? Do electron travels thorugh wire, if 300 000km wire is connected to bulb ,why electricitly travel through space only 1m??

Until new theory comes out and prove this one wrong. Maybe is better to wait 200,300 years, that the scientists find final one and agree among themselves that is correct. Sabine Hossenfelder

Which explanation of these two is corrrect? Sabine tell all this explanations are wrong. Man from my video say that electron will crash into nucleus using classic physics, so he conclude it cant be used for micro world..

Men In the video has engineering and phsysics degree, so why he post wrong theory or this video is made for kids? Is Einstein relativity works/exist in quntum mechanics ? Obvuisly classic physics dont work for electrons/atoms, but that not mean it is wrong for big objects as well, so why...

How?

It this correct explanation why quantum is not valid for large object? Why would small object want to hide their information?

Does information travel at higher speed then light between two particles in EPR paradox? Infinite speed?

Can you exlain how detectors work? If I just observe light that pass throug two slits with my eyes, will electrons show two lines on back screen? How can my thoughts change reality,results on back screen?

How detectors/observers in front of each slit works , does it somehow disturb with electron/photon? Does photon/electron must pass through detector/observer, so maybe his internal parts change final result on screen into just two lines?

So why they emphasize "bigger output than input"?

Fusion has bigger output then input, because produce more energy than to initiate reaction. This is allways case, for example 100kg of wood burning produce much more energy then initiate fire with one match fire. Can someone explain this statement?

:smile:

Where they dont teach cursive? US?:oldconfused: In EU does.. Problem is cursive is not standardized,even if it is , legibility will be always smaller. I mean grid.

Cursive is fastest but is hard to read and paper looks like real mess, imagine that books looks like this. I think is better for learning when paper looks nice,clean organized. Do you prefer cursive or all caps like engineers/architects often write? Legibility of this two words are...

There are lots of theories about this topic,this one tell there is not true that all caps are harder to read, but I think it is personal. https://www.blog.theteamw.com/2009/12/23/100-things-you-should-know-about-people-19-its-a-myth-that-all-capital-letters-are-inherently-harder-to-read/ I...

I know that light beam has diagonal trajectory, but I cant see it from this position/case..

I will see light clock bigger and bigger as train approching me..

If some one hold light clock and walk toward me,I see light beam inside clock moves verticaly up and down just as when clock is at rest. I am compare my clock and train clock, not train rear and back clock..

Does direction of train matters? I am at rest at railroad and train moves directly at me, then there is no time dilatation, because I will see train light beam inside light clock goes verticaly up and down,so tick at same rate as my clock. Is this correct?

If theory show that time is not absolute, can we state that time dont exist in some way? What is official definiton of time in physics?

This definiton is joke/useless, like you say speed is what speedometer meassure! I ask because of this: Albert Einstein once wrote: People like us who believe in physics know that the distinction between past, present and future is only a stubbornly persistent illusion. Time, in other words...

What is time for Einstein? Time tick slower in moving train only when we compare from clock that is at rest, but in train clock tick at regular rate. 1.So when train stops and when we then compare these two clocks, they will again show same time? If not, why not if indeed clock tick at...

At 1:33:26 - 1:34:16, he explain why time and space change together

Lorentz transfomation show time is relative,so what Einstien discover new?

Einstein is first one who tell time is not absolute? He get it from fact that light has constant speed?

I also notice that distance is changed looking from rest frame because the fact light has constant speed. does that tell me something about time? hm maybe like this: c=d/t, I first conclude d increase, so to keep c=const, I must increase t as well, that is proof that time also change. Is this OK?

But this thing dont need math is it pure logic(obviusly my is wrong, but cant find why) If I can explain why light need more time to hit right detector,only with "change in length", why do I need talk about time?

Dont understand.

This is how I at first look at this; fur sure light need more time to reach detector that is moving away for it, because light must travel longer distance to reach this detector. From frame at rest, distance L2 is longer then L1. So I would say distance "change" and that is reason why light...

If inside train is clock and I have my clock at station, then distance between station and train matters, further the station from the train, bigger will be difference in time between my and clock in train? I read that Lorenz and Poicare set this equations before Einstein, they knew that...

What do you mean by "where you are"? If you observe einstein train from 100m or from 100km, isnt the same? From 100km ,change in time will be bigger?

So you agree if you observe einstein train for grater distance, change in time will be bigger?

Here Green is talking about distnace between two observers/frames, your post 21 talk about distance between two detectors/lenght of train. Green tell if you observe train from bigger distance, change in time will be bigger.

Did you look at my video at 1:22 - 1:28 where Green show how even for low velocity if distance between two observers is big enough, change in time is big? What do say about this?

How is it possible that he is just not careful if he made animation(look at my video at 1:22) where he show how even for low velocity if distance between two observers is big enough, change in time is big.

But L is distance from light source to detector in train, not distance from how far I observe train?

https://www.enginehistory.org/Piston/Before1925/SiemensHalskeSh3/05Sh3.gif

Thanks for explanation. So Newton thought that speed of light in the train from ground frame is c+ train speed and c-train speed? He say at 1:22 if distance between two observers is far enough, time will also be very different even for low speeds. So distance between observers also make a...

Can you explain with example?

I dont understand why is speed of light absolute if distance and time are not, how we can get something absolute from something that is not absolute? Speed is derived from distance and time..

Time is in denominator, speed will not be constant if in denominator is 40sec or 20sec, so to keep it constant you must reduce numerator(distance) as well...

1. How much is acceleration of light? 2. Why is speed of light constant if time is relative, to keep speed constant distance must be changed as well? 3.What is time by Einstien? If we state it is not absolute, it is illusion, dont exsit? 4. Can we say ratio between distance and time is...

How block and crankshaft are conected to airplane? airplane for sure not rotate.

Listen just 1 minute, what does it mean when he said nobody understand quantum mechanics? This sound like comedy

If block and crankshaft both rotate, than what is at rest?

Yes that make sense. So earth stop engine/car to rotate around itself. If put engine is space, engine will rotate with slower RPM around itslef than crankshaft, because it has higher moment of inertia then crankshaft? It will rotate only when RPM is changed?